Valve bag



May 12, 1936. J. A. RosMAlT VALVE BAG Filed April 26, 1955 INVENTOR. y c/On A Posmaft @kA/XM Patented May 12, 1936 UNITED STATI-1S PATENT OFFICE VALVE BAG John A. man, Maumee, Mich. l Application April 2 6, 1935, Serial No. 18,312

\ 9Claims.

My invention relates to an improved valve bag wherein the valve structure is formed of material separate from the bag walls and which valve structure operates to effectively seal the ller opening against leakage.v

An object is to provide a bag of the character described provided with a valve controlling ller opening at one corner, which valve structure is formed of flexible sheet material folded upon itself to constitute a 'trough or tube structure and extends across the end of the bag within the bag and is secured in place by the line of stitching which secures thebag side walls together along such end. The material of which this valve structure is formed is extended outwardly vand downwardly over one or both side walls of.

the bag to a point below the line of stitching which secures the side walls together and is preferably so constructed and arranged as to reinforce the bag side walls along this line of stitching.

Theiller opening of the bag is generally formed by the side walls thereof being inturned bag side walls and the line of stitching whichsecures said side walls together. It depends within the bag to a point below said inturned corner portion and surrounds the same and is provided with a discharge opening which-may take the form of a slit extending from adjacent to said 4or of multi-ply material, whichever vis desired.

Other objects, advantages, and meritorious features of my invention will morefully appear from the following description, appended claims,

and accompanying drawing, wherein:

Figure 1 is a side elevation of the upper portion of the bag partly broken away and embodying my invention,

Fig. 2 is a plan of a sheet ofJ material which l is used to form the valve.structure shown in mills Y Fig. 3 is a cross-sectional view taken on line 3-3 of Fig. 1 when the bag is empty, y

Fig. 4 isa cross-sectional view through a modiiled form of construction showing the bag empty, Fig. 5 is a cross-section taken on line 5--5 of Fig. 1 when the bag is closed,

Fig. 6 is an elevation of a fragment of the upper portion of the bag embodying my invention in a modified form, and

Fig. '1 is a cross-sectional view taken on line I-'I of Fig. 6.

In the several ilgures of the drawing I have illustrated a bag of the valve type. These bags are commonly formed of multi-ply paper. In the several gures in order not to confuse the same with the multiplicity of lines the outer side wall of the bag indicated as I0 does not show that it is formed of separate plies ofv paper but preferably it would be so formed. This is well understood as .this type of bag is in common use in the art. These bags are generally formed from a paper tube 'which is cut oif in proper lengths and the ends of theportions stitched or otherwise secured together to form several bags. In one corner the side walls are turned inwardly, as at I2 in Figs. 1 and 6, to form a ller opening. I'he delivery spout of the filling machine is adaptedto be received through this iiller opening to discharge the desired contents into the bag.l The ends of the bag are stitched or secured together as by aline of stitching I4. These bags aire commonly used in the cement and lime industry wherein the material is in a powdered form.

The inturned corner I2 is relatively sti, comprising as it does a multiplicity of paper plies, and does not aiord an eiective seal to prevent leakage of the material through the illler opening.

To provide an eective valve seal I employ a sheet of ilexible material such as suitable paper which is illustrated in Fig. 2 in plan as I 6. This sheet of material is slit along the line I8 and is adapted to be folded upon itself and the opposite edges brought together between the side walls of the bag as shown in Figs. 3, 4,' 5, and 7 and secured in place therebetween by the line of stitching I4. In Figs. 3 and 5 reinforcement strips 20 are provided underneath the stitching. The sheet of material I6 is of such a length and so shaped as to extend entirely along the end of the bag within the bag depending therein from its'supporting line of stitching Il. It is in the form of a tube or trough which telescopes at one end over the infolded corner I2. 'Ihe slit Iii which is shown in Fig. 1 as extending throughout substantially the entire length of the strip from a point adjacent to but spaced from the inturned corner I2 provides an aperture through which the contents aredischarged from the spout into the interior of the bag.

Ixnthe 'embodiment shown in Fig. 1 and the cross-sectional. views of Figs. 3 and.5 this valve structure is formed of a plurality of layers or laminations of paper arranged in superimposed relationship. These several layers are individually free and are individually flexible so that the valve structure is highly 4flexible and readily compressible against 4the side walls ofthe bag due to the influence of the .content material to seal the valve opening as shown in Fig.' 5r

of a single thickness of paper or other suitable sheet material such as fabric or specially treated paper. It is very tough and exible. In this embodiment this valve structure. sheet is extended outwardly and downwardly over the side walls of the bag to a point below the line of stitching. It is shown as extending outwardly and downwardly over both side walls of the bag and as being disposed underneath the stitching so as to serve the purpose of reinforcement of the side walls to prevent the stitching tearing therethrough. This appears particularly in Figs. 4 and 7. Furthermore, in this gure of the drawing this insert is provided with a short aperture rather than a long slit. The aperture is indicated asv 22. It isI located adjacent `to but spaced slightly from the inturned corner I2 in the bag wall. It is of suiiicient extent to permit discharge of the bag contents into the bag. The valve structure itself is highly flexible and readily crumpled against the side walls to form an effective seal to prevent leakage of the material through the valve opening.

What I claim:

1. A valve bag having opposite side walls secured-together' at one end by a lineof stitching and provided with a valve opening at one corner n with an opening for a portion of its length along its lower edge adjacent to but spaced from said valve opening.

2. A valve bag having opposed side walls fastened together along one end by a line of securement and provided with a valve opening at one corner of said end,exible sheet material folded upon itself to form a valve tube extending across said end within the bag as an extension of the valve opening and provided with a discharge aperture along its lower edge adjacent to said valve opening, said folded sheet material having its side walls arranged between the side walls of the bag and-secured in place by the line of securement thereof overlying within the bag said line of securement between the bag side walls throughout the entireilength thereof and being extended outwardly and downwardly over each side wall of the bag to a point below said line of securement.

3. Al valve bag having opposed side walls secured together along one end by a line of stitching except for a short distance at one corner, saidside walls being inturned at such corner and providing a valve opening, a sheet of ilexible material folded upon itself forming a trough shaped element arranged between the sidewalls of the bag at such end and extending across the end of the bag within the bag, the two sides of said trough element being extended outwardly and downwardly overv the side walls of the bag to a point below said line of stitching, said trough likeelement forming a tubular extension of said inturned corner portion of the side walls of the bag and being itself provided with an opening along its bottom adjacent to said inturned corner portion. Y Y

4. A valve bag having opposed side walls secured together along one end by a line of stitching except for a short'distance at one corner, said side Walls being inturned at such corner and providing a valve opening, a sheet of exible material folded upon itself forming a trough shaped element arranged between the side walls of the v`bag at `such end and extending across the end of the bag within the bag, the two sides of said trough element being extended outwardly and downwardly over said side walls of the bag to a point below said line of stitching, said trough like element depending within the bag to a point below said inturned corner portion' of said. side walls and telescoped over said inturned corner portionproviding a tubular extension thereof and itself provided with a discharge opening spaced from the end of said inturned corner portion.

5. A valve bag having opposed side walls secured together along one end by a line of stitching except for a short distance at one corner, said side walls being inturned at such) corner and providing a valve opening, a sheet of flexible material folded upon itself forming a trough shaped element arranged between the side walls of the bag at such end and extending across the end of the bag within the bag, said trough like structure forming a tubular extension of the inturned corner portion of the side walls ofthe bag and being itself provided with a discharge opening'adjacent to but spaced inwardly from 'said inturned corner portion and being formed of a plurality of superimposed separately flexible independent laminations. i l

6. A valve bag having its opposite side walls secured together at one endand provided with a flexible material foldedupon itself and having itsv juxtaposed edges disposed between the side walls of the bag at said end and secured therebetween by saidline of stitching and forming a tubular element extending entirely across said end of the bagwithin the bag overlying the line of stitching between the bag side walls constituting a tubular `extension of the valve opening and telscoping over the inturned corner of said side walls which form the valve opening, said tubular element pro.- vided with an opening along the fold line adjacent to said valve opening.

8. A valve bag having yits opposite side walls secured together at one end by-a line of stitching and provided with a valve opening at one corner of said end, a flexible sheet extending across said end within the bag and constituting a flap like portion adapted to overlie the line of stitchingv within the bag throughout its entire length and to assist in sealing the valve opening.

9. A valve bag having its opposite side walls secured together at one end and provided with a strip of flexible sheet material arranged'within `the bag at such end and extending across said end and adapted to overlie the line of securement of the side walls within the bag throughout its entire length of said end and to overlap said side 

